======================================
| [   14.535304][    C3] 1 lock held by ksoftirqd/3/32:
| [ 14.535489][ C3] #0: ffffffffb07774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.535817][    C3]
| [   14.535817][    C3] stack backtrace:
[   14.536050][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.536052][    C3] Call Trace:
[   14.536054][    C3]  <TASK>
[ 14.536056][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.536062][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.536066][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.536070][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.536075][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.536081][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.536084][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.536087][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.536091][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.536095][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.536098][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.536102][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.536106][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.536109][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.536114][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.536117][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.536120][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 14.536125][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.536127][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 14.536133][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 14.536137][ C3] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.536142][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.536145][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 14.536148][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.536153][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.536156][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.536158][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.536161][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.536164][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.536170][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.536173][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.536177][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.536179][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.536184][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.536187][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.536190][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.536193][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.536197][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.536201][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.536205][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.536208][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.536211][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.536215][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.536219][ C3] kthread (kernel/kthread.c:464) 
[ 14.536222][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.536224][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.536226][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.536230][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.536233][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.536236][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.536238][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.536241][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.547450][    C3] RCU nest depth: 0, expected: 0
| [   14.547620][    C3] INFO: lockdep is turned off.
| [   14.547789][    C3] Preemption disabled at:
| [ 14.547791][ C3] handle_softirqs (kernel/softirq.c:553) 
[   14.548144][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.548146][    C3] Call Trace:
[   14.548147][    C3]  <TASK>
[ 14.548149][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.548154][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 14.548160][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.548164][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.548167][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.548170][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.548173][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 14.548179][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.548181][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 14.548184][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.548189][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.548192][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 14.548196][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 14.548200][ C3] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.548203][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.548206][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 14.548209][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.548213][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.548215][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.548217][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.548221][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.548224][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.548230][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.548233][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.548237][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.548239][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.548244][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.548247][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.548250][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.548253][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.548257][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.548260][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.548264][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.548268][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.548271][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.548274][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.548278][ C3] kthread (kernel/kthread.c:464) 
[ 14.548281][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.548283][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.548286][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.548289][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.548292][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.548295][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.548298][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.548300][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.112098][    C2] INFO: lockdep is turned off.
| [   16.112297][    C2] Preemption disabled at:
| [ 16.112299][ C2] 0x0 
| [   16.112671][    C2] Tainted: [W]=WARN
[   16.112672][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.112674][    C2] Call Trace:
[   16.112676][    C2]  <IRQ>
[ 16.112678][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.112687][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.112694][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.112699][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.112702][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.112706][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.112711][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.112717][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.112719][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.112723][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.112728][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.112731][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.112737][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.112741][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.112746][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.112749][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.112753][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.112757][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.112762][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.112766][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.112770][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.112772][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.112775][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.112778][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.112780][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.112783][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.112786][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.112792][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.112796][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.112800][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.112804][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.112808][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.112810][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.112815][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.112818][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.112825][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.112831][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.112835][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.112840][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.112844][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.112846][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.112850][    C2]  </IRQ>
[   16.112851][    C2]  <TASK>
[ 16.112853][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.112856][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.112860][ C2] Code: 92 b5 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 fc 54 02 00       	jmp    0x25501
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   16.112863][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.112866][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffaf7905d9
[   16.112868][    C2] RDX: ffffed1006c266fb RSI: ffffffffafa53b60 RDI: ffffffffacf8d18f
[   16.112870][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   16.112872][    C2] R10: ffff8880361337d3 R11: ffffffffb31108d8 R12: 0000000000000000
[   16.112873][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.112877][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.112881][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.112884][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.112887][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.112890][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.112893][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.112897][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.112902][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.112905][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.112908][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.112911][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal